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Video shows people feeling a country music festival in Las Vegas after a gunman opened fire from inside the Mandalay Bay Resort and Casino. Authorities said that more than 50 people were killed and more than 500 wounded. (Published Monday, Oct. 2, 2017)

What to Know

At least 58 people were killed and more than 400 sent to hospitals in what cops describe as the deadliest mass shooting in modern US history

The gunman has been identified as Stephen Paddock, of Mesquite, Nevada; he was found dead in his 32nd floor room in the Mandalay Bay hotel

Tens of thousands ran for their lives, screaming, as gunfire erupted; it was believed to have been a "lone wolf" attack, authorities said

After a gunman opened fire on a country music festival on the Las Vegas Strip late Sunday, killing at least 59 people and wounding 527 others, performers at the event described the "chaotic" and "heartbreaking" scene.

Bullets rained down as Jason Aldean sang onstage at the Route 91 Harvest Festival, forcing performers and concertgoers to flee the area.

Singer Jake Owen was also onstage during the shooting, and he told NBC News it felt "like a movie."

"You could hear it ringing off the rafters of the stage," he said. "Everyone onstage started running anywhere possible. It was pretty chaotic for sure."

"I ran just like everyone else," Owen added. "There was blood on people. ... It was literally like a movie you feel like you’ve seen before that's not real life... It was pretty chaotic for a pure seven to 10 minutes."

Musician Chris Young was at the festival and said on Twitter that he stayed "on the floor of a trailer behind the stage," calling the shooting "heartbreaking."

Caleb Keeter, guitarist for the Josh Abbott Band, said on Twitter that witnessing the shooting had changed his pro-Second Amendment stance.

"I’ve been a proponent of the 2nd amendment my entire life," he wrote. "Until the events of last night. I cannot express how wrong I was. We actually have members of our crew with CHL licenses, and legal firearms on the bus. They were useless. We couldn’t touch them for fear police might think that we were part of the massacre and shoot us.”